ISOLATION OF WATER INFLOW BEDS AT WELL CONSTRUCTION Russian patent published in 2014 - IPC E21B33/138 C09K8/508 

FIELD: mining.

SUBSTANCE: proposed method comprises exposure of water inflow beds by drilling. Then sump is drilled to depth which allows allocation of the assy during expansion of water inflow beds. Drill string with drill bit is withdrawn from the well. Then, pipe string lower end at wellhead is equipped the assy including 1.6-time well shaft expander and jet head. Pipe string with said assy is lowered in the well unless expander teeth are opposite the expansion interval top edge. The entire interval of water inflow beds is expanded. Ball in diameter smaller than pipe string ID is thrown therein. Overpressure is created in pipe string. Thereafter, said ball shuts off the expander to open jet head opening. Pipe string is lowered so that jet head openings are opposite water beds interval top boundary to make jet processing of expansion interval to its bottom boundary. Pipe spring is withdrawn to lower grout pipe string to bottom boundary of expansion interval. Well is flushed. Thereafter, grouting mortar is forced via grout pipe string in well shaft to water bed roof. Grout pipe string is lifted 5 m above water bed roof to flush the well and to create counter pressure to water beds. Then, the well is left for hardening of grouting mortar. Note here that grouting mortar is composed by mixing 74.1-87 wt % of acetone formaldehyde resin, 4.3-11.1 wt % of epoxy resin and 8.7-14.8 wt % of polyethylene polyamine.

EFFECT: higher efficiency of isolation.

1 tbl, 4 dwg